Rocca Calascio is a mountaintop fortress or rocca in the Province of L'Aquila in Abruzzo, Italy. At an elevation of , Rocca Calascio is the highest fortress in the Apennines. Built of stone and masonry exclusively for military purposes and intended only to accommodate troops and never as residence for nobles, the fortress overlooks the Plain of Navelli at one of the highest points in the ancient Barony of Carapelle. Rocca Calascio lies within the Gran Sasso e Monti della Laga National Park and alongside the high plain of Campo Imperatore.